PHP上的正则表达式

Question

我在使用正则表达式拆分字符串时遇到问题。

我搜索了regex以在大写单词上拆分字符串，但我需要的是分割字符串，如下例所示。

拥有此示例数据：

This is First SentenceThis is Second Sentence

......字符串应该像这样拆分：

This is First Sentence
This is Second Sentence 

任何人都知道解决方案吗？

Answer 1

您可以将\K令牌与lookahead断言结合使用。

$str = 'This is First SentenceThis is Second Sentence';
$results = preg_split('~[a-z]\K(?=[A-Z])~', $str);
print_r($results);

或者同时使用look-behind和lookahead断言：

$results = preg_split('~(?<=[a-z])(?=[A-Z])~', $str);

输出

Array
(
    [0] => This is First Sentence
    [1] => This is Second Sentence
)